CVE-2021-21358

lowpriority · track · 22EPSS 0.009 · 59 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.87% (59th) EPSS

CVSS 3.5 · low

Is it mine?

12 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1.

cvss

Technical severity, 0–10. One row per scoring source.

5.4

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.5–5.4

v2.03.5lowAV:N/AC:M/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 2.9

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.3 · impact 2.7

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.3 · impact 2.7

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:Csecondary · OSV

v3.15mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USCWE-79US

affected products (12)

Products and version ranges known to be affected.

TYPO3 TYPO3.CMS≤ 10.2.0, ≤ 10.4.13enisa_euvdEU
TYPO3 TYPO3.CMS≤ 11.0.0, ≤ 11.1.0enisa_euvdEU
typo3 typo310.2.0 → 10.4.14nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo311.0.0 → 11.1.1nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
Bitnami typo310.2.0 → 10.4.14osvUSpkg:bitnami/typo3
Bitnami typo311.0.0 → 11.1.1osvUSpkg:bitnami/typo3
Packagist typo3/cms10.0.0 → 10.4.14osvUSpkg:composer/typo3/cms
Packagist typo3/cms11.0.0 → 11.1.1osvUSpkg:composer/typo3/cms
Packagist typo3/cms-core10.0.0 → 10.4.14osvUSpkg:composer/typo3/cms-core
Packagist typo3/cms-core11.0.0 → 11.1.1osvUSpkg:composer/typo3/cms-core
Packagist typo3/cms-form10.2.0 → 10.4.14osvUSpkg:composer/typo3/cms-form
Packagist typo3/cms-form11.0.0 → 11.1.1osvUSpkg:composer/typo3/cms-form

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-x79j-wgqv-g8h2Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in typo3/cms-form2021-03-23ghsa · osvUS
### Problem It has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. ### Solution Update to TYPO3 versions 10.4.14 or 11.1.1 that fix the problem described. ### Credits Thanks to Richie Lee who reported this issue and to TYPO3 framework merger Andreas Fernandez who fixed the issue. ### References * [TYPO3-CORE-SA-2021-004](https://typo3.org/security/advisory/typo3-core-sa-2021-004)
BIT-typo3-2021-213582024-03-06vendor · osvUS
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2021-03-23modified 2026-06-17

references (12)

External citations — patches, advisories, analysis.

scry

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